Instead of uploading CA certificate from your local directory, an easier way is to configure FortiWeb to obtain a CA certificate from Let's encrypt on behalf of you.
It's recommended to configure Let's Encrypt certificate through Web UI, where more functions are offered. Refer to "Let's Encrypt certificates" in FortiWeb Administration Guide.
To use this command, your administrator account’s access control profile must have either
rw permission to the
admingrp area. For details, see Permissions.
show system certificate letsencrypt
config system certificate letsencrypt
|Enter the name of a certificate file. The maximum length is 63 characters.
|FortiWeb will then retrieve the CA certificate for this domain from Let's encrypt.